(2*10^n-9)/11; cyclic, {0,4}, so no problems there, and n is odd.

1/181 has a period of 180, so I'm guessing the next n is big, and if n=3 is a solution, then so is n=183.

So there will be 182 nines.

Edited on January 29, 2016, 11:14 am

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